Eramosa Formation (Silurian limestone and dolostone)
E930754
The Eramosa Formation is a Silurian-age carbonate rock unit in Ontario, Canada, noted for its finely laminated limestone and dolostone that preserve exceptionally detailed fossils and sedimentary structures.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Eramosa Formation (Silurian limestone and dolostone) canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11517763 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Eramosa Formation (Silurian limestone and dolostone) Context triple: [Eramosa River, geologicalContext, Eramosa Formation (Silurian limestone and dolostone)]
-
A.
Salem Limestone formation
The Salem Limestone formation is a thick, fossil-rich Mississippian-age limestone unit in the U.S. Midwest, widely quarried as a high-quality building stone used in many prominent American structures.
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B.
Gaskiers Formation
The Gaskiers Formation is a Neoproterozoic rock unit in Newfoundland, Canada, notable for preserving geological evidence of one of the late Precambrian global glaciations.
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C.
Redwall Limestone
Redwall Limestone is a prominent Mississippian-age marine limestone formation best known for forming massive, sheer cliffs in the Grand Canyon region of the southwestern United States.
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D.
Yeso Formation
The Yeso Formation is a geologic unit of early Permian age in the southwestern United States, notable for its thick sequences of evaporites and sandstones that record arid, shallow-marine and coastal depositional environments within the Permian Basin region.
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E.
Salem Limestone
Salem Limestone is a Mississippian-age sedimentary rock formation widely quarried in the U.S. Midwest, especially Indiana, and prized as a high-quality building stone.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Eramosa Formation (Silurian limestone and dolostone) Target entity description: The Eramosa Formation is a Silurian-age carbonate rock unit in Ontario, Canada, noted for its finely laminated limestone and dolostone that preserve exceptionally detailed fossils and sedimentary structures.
-
A.
Salem Limestone formation
The Salem Limestone formation is a thick, fossil-rich Mississippian-age limestone unit in the U.S. Midwest, widely quarried as a high-quality building stone used in many prominent American structures.
-
B.
Gaskiers Formation
The Gaskiers Formation is a Neoproterozoic rock unit in Newfoundland, Canada, notable for preserving geological evidence of one of the late Precambrian global glaciations.
-
C.
Redwall Limestone
Redwall Limestone is a prominent Mississippian-age marine limestone formation best known for forming massive, sheer cliffs in the Grand Canyon region of the southwestern United States.
-
D.
Yeso Formation
The Yeso Formation is a geologic unit of early Permian age in the southwestern United States, notable for its thick sequences of evaporites and sandstones that record arid, shallow-marine and coastal depositional environments within the Permian Basin region.
-
E.
Salem Limestone
Salem Limestone is a Mississippian-age sedimentary rock formation widely quarried in the U.S. Midwest, especially Indiana, and prized as a high-quality building stone.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
Silurian stratigraphic unit
ⓘ
carbonate rock unit ⓘ geologic formation ⓘ |
| bedding |
laminated
ⓘ
thinly bedded ⓘ |
| contains |
algal laminations
ⓘ
bedding-plane fossil assemblages ⓘ bituminous layers ⓘ fossil invertebrates ⓘ laminated microbial mats ⓘ stromatolitic structures ⓘ trace fossils ⓘ |
| country | Canada ⓘ |
| depositionalEnvironment |
restricted lagoonal environment
ⓘ
shallow marine setting ⓘ |
| fossilPreservationQuality | exceptional ⓘ |
| geologicAge | Silurian ⓘ |
| geologicProvince | Michigan Basin NERFINISHED ⓘ |
| geologicTimeSpan | Middle Silurian NERFINISHED ⓘ |
| hasColor |
black
ⓘ
dark brown ⓘ |
| hasEconomicUse |
building stone
ⓘ
dimension stone ⓘ |
| hasOutcropsIn | Niagara Escarpment area NERFINISHED ⓘ |
| hasOutcropsNear |
Eramosa River valley
NERFINISHED
ⓘ
Guelph, Ontario NERFINISHED ⓘ |
| knownFor |
exceptional fossil preservation
ⓘ
finely laminated bedding ⓘ well-preserved sedimentary structures ⓘ |
| lithology |
dolostone
ⓘ
limestone ⓘ |
| locatedIn |
Ontario
ⓘ
southern Ontario NERFINISHED ⓘ |
| namedAfter | Eramosa River NERFINISHED ⓘ |
| overlies | Amabel Formation NERFINISHED ⓘ |
| partOf |
Paleozoic stratigraphy of Ontario
ⓘ
Silurian stratigraphy of the Michigan Basin ⓘ |
| period | Silurian ⓘ |
| preserves |
exceptionally detailed fossils
ⓘ
fine sedimentary structures ⓘ |
| primaryLithology |
finely laminated dolostone
ⓘ
finely laminated limestone ⓘ |
| region | Great Lakes region NERFINISHED ⓘ |
| rockType | carbonate rock ⓘ |
| stratigraphicUnitOf | Niagara Escarpment NERFINISHED ⓘ |
| texture | fine-grained ⓘ |
| underlies | Guelph Formation NERFINISHED ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Eramosa Formation (Silurian limestone and dolostone) Description of subject: The Eramosa Formation is a Silurian-age carbonate rock unit in Ontario, Canada, noted for its finely laminated limestone and dolostone that preserve exceptionally detailed fossils and sedimentary structures.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.